Some of you may have listened to the debate between Richard and bananabrain (durianrider) a little while back, and I'm only now putting this together.
BB needs substantial amounts of fruit to get the proper amount of protein.
BB needs to workout to the point of insanity to avoid letting the mellons turn him into a mellon.
BB needs b12 shots to fuel his level of exercise (by his own admition in the debate).

Therefore, even if his b12 deficiency is exercise induced it is still a result of his diet. How did we not figure this out before?